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Finding the Fourth Proportional to 19.42, 26.75 and 15.78

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Solution

The fourth proportional to 19.42, 26.75 and 15.78 is: 21.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.42 : 26.75 = 15.78 : x
  2. Step 2: Convert to fraction form
    19.42/26.75 = 15.78/x
  3. Step 3: Cross multiply
    19.42x = 26.75 × 15.78
  4. Step 4: Simplify right side
    19.42x = 422.12
  5. Step 5: Solve for x
    x = 422.12/19.42
  6. Step 6: Final answer
    x = 21.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.